[Enhancement]: Graceful offline support #590

When disconnected from the internet and Obsidian git still attempts to pull changes it throws some panicky error messages.

Check the connectivity to githubstatus before attempting to pull/push changes

src/main.ts

@@ -740,6 +740,36 @@ export default class ObsidianGit extends Plugin {
         return Platform.isDesktopApp;
     }
 
+    async apiEndpointError() {
+        try {
+            // none, minor, major, or critical
+            return await fetch('https://www.githubstatus.com/api/v2/status.json')
+            .then((response) => response.json())
+            .then(({ status: { indicator } }) => indicator)
+            .catch((error) => {
+                console.warn('githubStatusError', error);
+                return 'disconnected';
+            });
+        } catch (error) {
+            console.warn('githubStatusError', error);
+            return 'disconnected';
+        };
+    }
+
+    async isConnectionEstablished() {
+        switch(await this.apiEndpointError()) {
+            case "disconnected":
+                new Notice('No Connectivity')
+                return false;
+            case "critical":
+                new Notice('Github API Server Outage')
+            case "major":
+                console.warn('Github API Major Server Outage')
+            default:
+                return true;
+        }
+    }
+
     async init(): Promise<void> {
         this.showNotices();
 
@@ -926,6 +956,7 @@ export default class ObsidianGit extends Plugin {
     ///Used for command
     async pullChangesFromRemote(): Promise<void> {
         if (!(await this.isAllInitialized())) return;
+        if (!(await this.isConnectionEstablished())) return;
 
         const filesUpdated = await this.pull();
         this.setUpAutoBackup();
@@ -956,10 +987,13 @@ export default class ObsidianGit extends Plugin {
     ): Promise<void> {
         if (!(await this.isAllInitialized())) return;
 
+        const isConnected = await this.isConnectionEstablished();
+
         if (
             this.settings.syncMethod == "reset" &&
             this.settings.pullBeforePush
         ) {
+            if (!isConnected) return;
             await this.pull();
         }
 
@@ -975,6 +1009,7 @@ export default class ObsidianGit extends Plugin {
         if (!this.settings.disablePush) {
             // Prevent plugin to pull/push at every call of createBackup. Only if unpushed commits are present
             if (await this.gitManager.canPush()) {
+                if (!isConnected) return;
                 if (
                     this.settings.syncMethod != "reset" &&
                     this.settings.pullBeforePush
@@ -1166,9 +1201,9 @@ export default class ObsidianGit extends Plugin {
 
     async push(): Promise<boolean> {
         if (!(await this.isAllInitialized())) return false;
-        if (!(await this.remotesAreSet())) {
-            return false;
-        }
+        if (!(await this.remotesAreSet())) return false;
+        if (!(await this.isConnectionEstablished())) return false;
+
         const hadConflict = this.localStorage.getConflict() === "true";
         if (this.gitManager instanceof SimpleGit)
             await this.mayDeleteConflictFile();